[02:50:42] samcandio leaves the room [04:09:13] jamesconrad leaves the room [04:54:58] merlinbest leaves the room [05:53:50] asakomatsumoto leaves the room [15:00:09] EX2306_DIVE13 ROV powered off [15:14:21] EX2306_DIVE14 test [15:39:32] EX2306_DIVE14 ROV powered off [15:57:33] EX2306_DIVE14 ROV powered off [16:15:57] EX2306_DIVE14 ROV Launch [16:24:49] EX2306_DIVE14 ROV on Surface [16:25:49] EX2306_DIVE14 ROV Descending [16:27:18] LAT : 55.910948 , LON : -135.493698 , DEPTH : 25.6215 m, TEMP : 10.29828 C, SAL : 31.29082 PSU, DO : 7.84595 mg/l, TURBIDITY : 0.9707 FTU [16:32:18] LAT : 55.90967 , LON : -135.495293 , DEPTH : 52.6513 m, TEMP : 8.47143 C, SAL : 32.14292 PSU, DO : 6.29024 mg/l, TURBIDITY : 0.9524 FTU [16:37:19] LAT : 55.909666 , LON : -135.494982 , DEPTH : 177.1911 m, TEMP : 6.63123 C, SAL : 33.74631 PSU, DO : 3.79446 mg/l, TURBIDITY : 0.9096 FTU [16:42:20] LAT : 55.90997 , LON : -135.494941 , DEPTH : 331.2465 m, TEMP : 5.31333 C, SAL : 33.91814 PSU, DO : 2.25462 mg/l, TURBIDITY : 0.8852 FTU [16:47:21] LAT : 55.90985 , LON : -135.495075 , DEPTH : 478.2847 m, TEMP : 4.71217 C, SAL : 34.0181 PSU, DO : 1.37697 mg/l, TURBIDITY : 0.8791 FTU [16:50:44] good morning everyone, thanks for joining us on chatham seep :) FYI we'll be doing a pelagic transect on the ascent, please pipe in if you have a preference of which depths we target [16:52:22] LAT : 55.909707 , LON : -135.494598 , DEPTH : 630.3652 m, TEMP : 4.33344 C, SAL : 34.12112 PSU, DO : 0.81341 mg/l, TURBIDITY : 0.8791 FTU [16:54:53] merlinbest leaves the room [16:57:22] LAT : 55.909729 , LON : -135.494093 , DEPTH : 685.0248 m, TEMP : 4.11647 C, SAL : 34.15639 PSU, DO : 0.66538 mg/l, TURBIDITY : 0.8791 FTU [17:02:22] LAT : 55.909726 , LON : -135.493718 , DEPTH : 684.4255 m, TEMP : 4.11992 C, SAL : 34.15481 PSU, DO : 0.67316 mg/l, TURBIDITY : 0.8852 FTU [17:07:23] LAT : 55.909684 , LON : -135.493242 , DEPTH : 685.1459 m, TEMP : 4.13848 C, SAL : 34.1505 PSU, DO : 0.66047 mg/l, TURBIDITY : 0.8791 FTU [17:07:51] owlfish [17:09:06] squid? Planctoteuthis? or siphonophore [17:09:32] kelleybrumley leaves the room [17:12:24] LAT : 55.909469 , LON : -135.492849 , DEPTH : 720.1159 m, TEMP : 4.05246 C, SAL : 34.17063 PSU, DO : 0.63845 mg/l, TURBIDITY : 0.8852 FTU [17:14:12] EX2306_DIVE14 ROV on Bottom [17:14:40] Sablefish [17:15:06] maybe Cold Seep is a better term, it probably has more hydrocarbons than just methane. [17:15:25] sculpin [17:15:55] robertcarney leaves the room [17:17:24] LAT : 55.909455 , LON : -135.492859 , DEPTH : 739.3378 m, TEMP : 4.0023 C, SAL : 34.18167 PSU, DO : 0.57933 mg/l, TURBIDITY : 0.8913 FTU [17:17:45] seanrooney leaves the room [17:19:13] eelpout [17:19:17] viperfish [17:19:21] looks like carbonate thre [17:19:39] Loneline gear [17:21:31] seanrooney leaves the room [17:22:13] eypniates by camera quickly [17:22:16] sablefish? [17:22:25] LAT : 55.909432 , LON : -135.492619 , DEPTH : 737.3875 m, TEMP : 4.01627 C, SAL : 34.1769 PSU, DO : 0.61371 mg/l, TURBIDITY : 0.8974 FTU [17:22:59] lots of sablefish in the area [17:23:54] robertcarney leaves the room [17:24:53] viperfish [17:25:32] ? Has anybody picked up acoustic signature of a bubble plume while passively listening [17:25:54] careful interpreting "size" of plume from multibeam, it's bubbles in water column after all. it depends on ship direction, motion, speed, the sonar etc. [17:26:59] seanrooney leaves the room: Replaced by new connection [17:27:25] LAT : 55.909487 , LON : -135.492581 , DEPTH : 736.738 m, TEMP : 4.00727 C, SAL : 34.18 PSU, DO : 0.57557 mg/l, TURBIDITY : 0.8791 FTU [17:27:41] @ robert I believe MBARI has set out hydrophones at seep sites to "listen" for the bubbles [17:27:47] have you bios ever seen a change in the watercolumn diversity around a seep? [17:28:11] christophermah leaves the room [17:28:35] Long-lining involves using a longline (ground line) with baited hooks on leaders attached at intervals. Sablefish (black cod) and halibut are caught on longline gear [17:28:50] jamesconrad leaves the room [17:29:47] @kelley -- I don't think that enough water-column oobservations have been done to answer that question. [17:29:59] Poralia [17:30:13] amandamaxon leaves the room [17:31:05] I try to notice but I dont know from biology, but I wish we recorded that. I just heard something about change in the deep scattering layer around here. [17:31:10] @jc thanks.. [17:31:24] crab [17:31:35] seanrooney leaves the room [17:32:19] @ kb scattering layers are impacted by high topo in some data [17:32:26] LAT : 55.909373 , LON : -135.492859 , DEPTH : 735.009 m, TEMP : 4.00912 C, SAL : 34.17927 PSU, DO : 0.57156 mg/l, TURBIDITY : 0.8852 FTU [17:33:42] DSLs actually run aground during the day in high-topography areas, feeding those nasty benthic things. [17:34:08] lobate ctenopore [17:34:51] arvindshantharam leaves the room [17:35:12] did ya'll do geochem on the sediments in the core? C1-C15? [17:37:26] LAT : 55.909462 , LON : -135.492454 , DEPTH : 734.9716 m, TEMP : 4.02378 C, SAL : 34.1756 PSU, DO : 0.56086 mg/l, TURBIDITY : 0.8791 FTU [17:39:28] @ kb see Prouty et al 2020 for details [17:40:31] seanrooney leaves the room [17:42:27] LAT : 55.9094 , LON : -135.492957 , DEPTH : 740.007 m, TEMP : 3.99197 C, SAL : 34.18267 PSU, DO : 0.57764 mg/l, TURBIDITY : 0.8913 FTU [17:42:47] rockfish [17:43:03] @kb there was also water chemistry done on the cores, sorry, I don't have a ref for that [17:43:10] are others hearing 2 x Merlin on the audio? [17:43:28] Sablefish are a long-lived species with forty-year old fish commonly caught in the commercial fishery. [17:45:13] no audio for me [17:45:21] Sea whip as well [17:45:44] benthic medusa? [17:46:12] audio fixed thx [17:46:35] crab [17:46:47] yes tanner [17:47:02] Star looks like Nearchaster [17:47:27] LAT : 55.90943 , LON : -135.49291 , DEPTH : 737.4759 m, TEMP : 3.99376 C, SAL : 34.18351 PSU, DO : 0.562 mg/l, TURBIDITY : 0.8974 FTU [17:47:42] Good morning all. Really nice to see there are active bubble flares in this region. It is really interesting too to note the abundance of these sable fish. Alvin dives just last week at 800m on Hydrate Ridge (an active clathrate hydrate) off of Oregon were inundated with sable fish in such great abundance they had serious difficulty completing their seafloor work. The sub was surrounded and followed all day by massive "schools" of sable fish. [17:47:46] marywicksten leaves the room [17:48:39] Chionoecetes bairdi = Tanner Crab [17:49:34] robertcarney leaves the room [17:50:01] fishing line? [17:50:42] Bivalve shells? [17:52:27] LAT : 55.909634 , LON : -135.493126 , DEPTH : 733.0112 m, TEMP : 3.99532 C, SAL : 34.18205 PSU, DO : 0.58171 mg/l, TURBIDITY : 0.8913 FTU [17:52:38] Encrusting sponge? [17:53:16] robertcarney leaves the room [17:53:20] White is encrusting sponge [17:53:25] @timshank The Lapham/Pohlman group had trouble with sablefish at Astoria Canyon 2 weeks ago with Alvin too! [17:54:24] yeah clams! [17:54:54] christophermah leaves the room [17:55:10] live mantle on bivalve [17:55:12] chiton [17:55:33] If we get a rock with chitons.. Doug Eernisse was telling me he can always use those! [17:55:41] mix of dead and live clams. @carolyn- yes, I heard the fish were so dense, they had to momentarily stop dive ops on the bottom. [17:55:48] carbonate table [17:56:07] we have a few chitons from previous dives as well [17:56:14] mushrrom coral [17:56:32] keep an eye out under ledges for hydrate [17:56:45] ooo! I will let him know! [17:57:26] jenniferaschoff leaves the room [17:57:28] LAT : 55.909542 , LON : -135.493305 , DEPTH : 731.239 m, TEMP : 4.00594 C, SAL : 34.17963 PSU, DO : 0.55352 mg/l, TURBIDITY : 0.8913 FTU [17:57:58] for a geophysicist, this organism is extremely cool and otherworldly [17:58:16] Yes likely Heteropolypus ritteri [17:58:27] lots of little snails [17:59:30] Oh my goodness, all of those tubular thin white sponges! [17:59:35] ditto what Kelley said...This has all the hallmarks of a sheet of carbonate that developed at depth with gas feeding (hydrate) just below. [17:59:46] And then cracked later on. [18:00:16] jenniferaschoff leaves the room [18:00:22] Dover sole [18:00:37] due to small mouth [18:00:44] finger-like sponges are novel at seeps for me [18:01:27] I've never seen that coloration for dover sole before. Is that a jeuvenile? [18:01:39] yes agreed would be good to grab a sample of sponges as poorly documented at seep site [18:01:41] samcandio leaves the room [18:01:52] Yeah - I'm more used to cladorhizids. Wonder if there are chemosymbionts associated with any of those sponges... [18:02:03] I always support sponge collections. [18:02:28] LAT : 55.909652 , LON : -135.493351 , DEPTH : 729.2141 m, TEMP : 4.01062 C, SAL : 34.17862 PSU, DO : 0.56796 mg/l, TURBIDITY : 0.8852 FTU [18:02:38] who was that star?? [18:03:08] @ChrisM Didn't get a good look [18:03:11] This carbonate is really similar to the sample of auth carbonate we saw further north in the Aleutians at another seep. The rounded cobbles-pebble dropstones were cemented by the carbonate. Why fewer worms here? Flux of methane? [18:03:18] cable [18:03:43] changing away from rich sponge community [18:03:49] the tubeworms might need soft sediment in which to set their 'roots' [18:05:00] Chuck Fisher's group showed that the tubeworm 'roots' mined the sulfide in the porewaters to support the chemoautotrophic symbionts of the trophosome. [18:05:02] Star at bottom right of screen, 4:30 [18:05:26] In camera 2 looking down on the ROV you can see a linear feature like a fault or fracture zone cutting across the carbonate [18:05:34] @jennifer yes on the flux. you will see tube worms increase near active seeping [18:06:12] mitchellhebner leaves the room [18:06:42] heatherjudkins leaves the room [18:06:47] @cindy I wonder if the 0.56 O2 here has any impact who whats here [18:07:06] jenniferaschoff leaves the room [18:07:29] LAT : 55.909614 , LON : -135.493467 , DEPTH : 725.7838 m, TEMP : 4.02903 C, SAL : 34.17488 PSU, DO : 0.60023 mg/l, TURBIDITY : 0.8913 FTU [18:08:06] @ cindy GoM tubeworms do quite well in carbonate with lots of small voids...threat through them. [18:08:23] bacteria matt, follow that! [18:08:43] matt at fissure [18:08:46] Wow! When first tuned in couldn't get over amount of carbonate! Is geologist surprised? Sorry, just tuned in. [18:08:51] @bob...interesting - no informed idea about O2 - except clams and tubeworms both need lots of O2 for thier chemos, as I understand it [18:09:35] nolanbarrett leaves the room [18:09:45] @heidi--Probable this whole area has been a seep for significant amount of time to get this kind of authigenic carbonate developed below surface and then exhumed [18:10:21] @Heidi this looked to be a pretty active seep, so lots of carbonate not unexpected [18:10:26] lots of juvenile clams [18:10:37] I am seeing bubbles? [18:10:48] A rock with spogees here would be great [18:10:52] notable lack of crustaceans (other than chaceon-like crab near landing)...or any mobile non-fish fauna...maybe when zoom in. [18:10:54] Wow! Big one! Thanks team. [18:12:30] LAT : 55.90976 , LON : -135.493574 , DEPTH : 726.4356 m, TEMP : 4.03428 C, SAL : 34.17397 PSU, DO : 0.59603 mg/l, TURBIDITY : 0.8913 FTU [18:13:04] jenniferaschoff leaves the room [18:13:24] samcandio leaves the room [18:14:07] so if you can get around the other side once you are done the ship move and look back, you might see hydrate under the carbonate here [18:14:11] Bubbles! Stunning cold seep habitat! [18:14:39] Bubbles are forming hydrate shells as soon as emitted. The wobble you see is the "ice-encrusted" (hydrate-encrusted) bubbles. See how they look smushed? [18:15:03] We are far within the hydrate stability zone at these water depths and temperatures. [18:15:09] jenniferaschoff leaves the room [18:15:12] different species of rockfish beyond bubbles. [18:15:49] Amazing! Hydrate shells?! [18:15:53] So this kind of bubble stream will make a nice signal in the hydroacoustics. You don't need much gas to create the anomalies we detect in hydroacoustic surveys. [18:16:23] Current depth? [18:16:39] ~~727 meters...See the "navdata" tab in the chat room [18:17:09] heatherjudkins leaves the room [18:17:18] South of you, at 550 m, we were above the hydrate depth. [18:17:20] Very ratty carbonate [18:17:26] Again those finger like sponges near the active vents [18:17:31] LAT : 55.909751 , LON : -135.493324 , DEPTH : 728.0074 m, TEMP : 4.0415 C, SAL : 34.1713 PSU, DO : 0.58973 mg/l, TURBIDITY : 0.8974 FTU [18:17:43] @cherisse...yes, the hydrate stability limit on this margin ranges from about 470 m to 550 m or 575 m [18:17:55] great jumble of carbonates with large voids [18:18:09] heidigartner leaves the room [18:18:12] depends on where you are...we are very firmly within the hydrate stability zone here [18:18:14] yeah Im not sure all these rocks need to form and depth and be exhumed. where there are active bubbles, carbonate seems to precipitate. I've cored carbonate tubes just below the surface of all sizes suggesting a plumbing system so the precipitation is pretty surficial. cute flattened bubbles! [18:18:34] nydrate? [18:18:36] That's awesome...much bigger bubles too [18:18:40] hydrate? [18:18:43] bubbles [18:18:50] Yes, that weird rock could be "hydrate" [18:19:00] speckled hydrate [18:19:04] looks a lot like what we see in Gulf of Mexico [18:19:37] Is it possible to put lasers on the gas bubbles for 30 s or so so we can get the size of bubbles? [18:20:09] Super---thank you pilots [18:21:07] Striking how different this looks than bubble emissions from soft seafloor [18:21:24] heidigartner leaves the room [18:21:43] mix of rock morphs [18:21:58] ChristinaConrath leaves the room [18:22:31] LAT : 55.909729 , LON : -135.493306 , DEPTH : 730.3348 m, TEMP : 4.03157 C, SAL : 34.17411 PSU, DO : 0.59949 mg/l, TURBIDITY : 0.8913 FTU [18:23:05] at least 3-m relief, looks like... [18:23:13] jenniferaschoff leaves the room [18:23:20] likely Fragile pink sea urchin = Strongylocentrotus fragilis [18:23:52] @carol, Ive wondered if its recent biogenic methane coming out of soft seds and these high flux carbonate type seeps are thermogenic since they are long lived? [18:24:02] The bubbles have been shown to carry sediment and "micronutrients" (I'm no biologist) and probably tiny fauna that would attract larger organisms. [18:24:23] Big debate in the literature re "dirty" vs clean bubbles. In nature, almost all bubbles are probably "dirty" to various degrees. [18:24:28] cherissedupreez leaves the room [18:24:45] nolanbarrett leaves the room [18:25:16] In the Pac NW, UW researchers used the reports of fisherpeople to find some of the initial gas seeps, and on the US Atlantic margin we note that the commercial fisherpeople often hang out near seeps too b/c they are great areas. [18:25:39] This is a great shot pilots. Thank you so very much. [18:25:43] ? is calcium sulfate ever a component of autigenic carbonates? [18:26:19] That's great Merlin. Thank you for asking them to do that. [18:27:31] LAT : 55.909732 , LON : -135.49331 , DEPTH : 730.0513 m, TEMP : 4.04178 C, SAL : 34.17304 PSU, DO : 0.60802 mg/l, TURBIDITY : 0.8974 FTU [18:27:38] So we are at least 4 degrees inside the gas hydrate stability zone here, which is quite a lot. It means that gas hydrate not exposed to seawater at these depths would be very stable. [18:28:22] no problem! everyone feel free to re-request things as i'm losing things in the chat :) [18:29:39] speckled white rocks again [18:29:43] Finger like sponges in rocks above would be great to sample after bubble imaging done [18:30:09] See the bubble wobble? Hydrate-encrusted [18:30:22] ChristinaConrath leaves the room [18:30:35] nolanbarrett leaves the room [18:30:50] Wow that's spectacular [18:31:38] heidigartner leaves the room [18:32:31] LAT : 55.909746 , LON : -135.493287 , DEPTH : 731.0344 m, TEMP : 4.04323 C, SAL : 34.17178 PSU, DO : 0.59891 mg/l, TURBIDITY : 0.8974 FTU [18:34:37] christophermah leaves the room [18:37:27] @ carolyn when hydrate goes to methane gas is there any thermal change. [18:37:32] LAT : 55.909739 , LON : -135.493281 , DEPTH : 730.544 m, TEMP : 4.04415 C, SAL : 34.17145 PSU, DO : 0.59959 mg/l, TURBIDITY : 0.8791 FTU [18:38:01] snails on the hydrate conglomerate... [18:38:09] heidigartner leaves the room [18:38:58] @robertcarney---yes it is endothermic Bob [18:39:07] exothermic formation; endothermic dissociation [18:39:38] thnks [18:39:58] ChristinaConrath leaves the room [18:40:14] If we had seen higher temps, it might have implied migrating warmer fluids, possibly bringing vapor phase gas up through the hydrate stability zone. Cooler temps might have implied endothermic heat of dissociation, so hydrate dissociating right there beneath the gas emission point [18:41:09] heidigartner leaves the room [18:41:31] the temp probe readings i'm seeing only read to the degree, so hard to see smaller changes [18:42:32] LAT : 55.909751 , LON : -135.493328 , DEPTH : 729.454 m, TEMP : 4.04755 C, SAL : 34.17195 PSU, DO : 0.60848 mg/l, TURBIDITY : 0.8852 FTU [18:42:49] does look like breccia [18:44:02] bacteria mats...isn't sulfide their energy source? [18:44:30] Very cool image [18:45:12] heidigartner leaves the room [18:45:27] @merlinbest Understood on T probe! It was cool that they tried it! [18:45:32] These might be Beggiatoa bacterial mats. They are filmentous bacteria associated [18:45:42] kelleybrumley leaves the room [18:45:58] That oxidize sulfide and are associated with seeps [18:46:14] suggests gastropod grazing on the wispy microbial filaments...local area bare among the microbial "mat" - thin filaments, but beggiatoa like. [18:46:44] gonna need some pronunciation help with Beggiatoa! [18:47:01] no sample of sponges? [18:47:24] I say "Beg-ee-uh-toe-uh" [18:47:33] LAT : 55.909761 , LON : -135.493306 , DEPTH : 728.6193 m, TEMP : 4.05534 C, SAL : 34.17021 PSU, DO : 0.60283 mg/l, TURBIDITY : 0.8791 FTU [18:49:00] christophermah leaves the room [18:49:03] I might prioritize the branching white fingerlike sponges. [18:50:38] ericaburton leaves the room [18:50:46] @ nolanbarrett agree on that as a priority [18:50:57] The branching sponges might be related to the demosponge Stelodoryx [18:51:15] @nolan - they do look interesting - they can be surprisingly dense in places [18:51:41] But Stelodoryx typically have branches that originate from a single stalk or base [18:51:58] bivalves aggregated in fissures [18:52:07] @Cindy Very much agreed! [18:52:13] not a thorny head. Possible yellow eye [18:52:16] heidigartner leaves the room [18:52:34] LAT : 55.909697 , LON : -135.493614 , DEPTH : 726.5917 m, TEMP : 4.05782 C, SAL : 34.16942 PSU, DO : 0.61217 mg/l, TURBIDITY : 0.9035 FTU [18:53:17] Sebastes ruberrimus = Yelloweye rockfish [18:54:29] janerudebusch leaves the room [18:54:37] nolanbarrett leaves the room [18:54:53] I think the clams need to stick their feet into the flow to suck up sulfide; lying flat on rocks may not be so effective in sulfide capture [18:55:58] bivalve shell incorporated in the carbonate matrix here [18:56:15] michaelvecchione leaves the room [18:56:29] kelleybrumley leaves the room [18:56:34] shortspine thornyhead (Sebastolobus alascanus) [18:57:34] LAT : 55.909813 , LON : -135.493739 , DEPTH : 727.3298 m, TEMP : 4.05575 C, SAL : 34.17082 PSU, DO : 0.58685 mg/l, TURBIDITY : 0.9158 FTU [18:57:38] eithjer a pedicellasterid or Sagenaster [18:57:38] ericaburton leaves the room: Replaced by new connection [18:57:53] lots of sablefish = lots of fishing pressure [18:59:10] Hippasteria.. but not close enuf for species. [19:02:35] LAT : 55.909855 , LON : -135.494215 , DEPTH : 724.5829 m, TEMP : 4.08787 C, SAL : 34.16301 PSU, DO : 0.62725 mg/l, TURBIDITY : 0.8791 FTU [19:02:55] Asbestopluma carnivorous spogne [19:03:09] heidigartner leaves the room [19:03:16] Interesting dead stalk [19:03:29] kelleybrumley leaves the room [19:04:40] Can't remember the citation, but one research group found that the sponge itself does not digest the organism that it catches. Turns out the bacteria associated with the sponge do the digestion and the sponge absorbs the nutrients [19:04:43] operculum [19:04:48] @Merlin operculum [19:04:49] operculum [19:05:36] Hello all [19:06:05] Operculum is also the name for the bones that provide protection for the gills of fish [19:06:11] @Asako Hello! [19:06:32] Hi Nolan! [19:06:37] Red = mushroom coral [19:06:51] orage = flytrap [19:06:56] christophermah leaves the room [19:07:35] LAT : 55.909931 , LON : -135.494568 , DEPTH : 721.4209 m, TEMP : 4.0971 C, SAL : 34.16171 PSU, DO : 0.62104 mg/l, TURBIDITY : 0.8913 FTU [19:09:09] What time will you leave bottom for midwater part of dive? [19:09:51] shell hash in depression [19:09:55] Blew pas a Swiftia (small red coral) [19:11:03] @cr about another hour or so [19:12:07] probably swiftia simplex [19:12:36] LAT : 55.909824 , LON : -135.495153 , DEPTH : 716.8246 m, TEMP : 4.09646 C, SAL : 34.16156 PSU, DO : 0.61857 mg/l, TURBIDITY : 0.928 FTU [19:13:04] carbs [19:13:55] RussellHopcroft leaves the room: Replaced by new connection [19:13:57] was that expulsion feature large enough to see in the multibeam? and did you collect good backscatter to map out the carbonate? [19:15:51] Polyplacophoran [19:15:52] crangonid shrimp [19:16:11] Asbestopluma [19:16:48] your large red brittle star was Stegophiura ponderosa = great armored brittle star [19:17:37] LAT : 55.909864 , LON : -135.495489 , DEPTH : 719.2071 m, TEMP : 4.09058 C, SAL : 34.16119 PSU, DO : 0.60918 mg/l, TURBIDITY : 0.9035 FTU [19:17:59] kelleybrumley leaves the room [19:18:11] @kb not sure the feature is big enough to show, the backsatter shows the carbonate pretty welll but the adjacent rocky seafloor is hard, too. [19:18:43] Psolus tentacles are hydrostatic and can be completely retracted. They have a repeating branching pattern. [19:20:35] nolanbarrett leaves the room [19:20:46] fish is short spine thornyhead [19:22:37] LAT : 55.909876 , LON : -135.495885 , DEPTH : 720.638 m, TEMP : 4.10188 C, SAL : 34.16041 PSU, DO : 0.63059 mg/l, TURBIDITY : 0.9646 FTU [19:22:51] larve bivalve dead [19:23:20] janerudebusch leaves the room [19:23:47] Scarlet King Crab. Sorry, too late :) [19:24:09] nolanbarrett leaves the room [19:26:14] holo poss Pannychia [19:26:38] holo - dorsal papillae small [19:27:18] heidigartner leaves the room [19:27:38] LAT : 55.909903 , LON : -135.49648 , DEPTH : 717.1015 m, TEMP : 4.09917 C, SAL : 34.16104 PSU, DO : 0.63051 mg/l, TURBIDITY : 0.9158 FTU [19:27:42] White coral possibly Parastenella [19:30:20] Lunch time [19:30:24] wow!! [19:30:56] nom nom nom [19:32:34] seanrooney leaves the room [19:32:39] LAT : 55.909979 , LON : -135.496801 , DEPTH : 715.8846 m, TEMP : 4.10384 C, SAL : 34.15927 PSU, DO : 0.62175 mg/l, TURBIDITY : 0.8974 FTU [19:34:55] kelleybrumley leaves the room [19:36:00] christophermah leaves the room [19:37:40] LAT : 55.909878 , LON : -135.497418 , DEPTH : 715.9552 m, TEMP : 4.10448 C, SAL : 34.15998 PSU, DO : 0.63295 mg/l, TURBIDITY : 0.989 FTU [19:38:10] White chiton you zoomed in on was Placiphorella pacifica = White-veiled Chiton [19:39:10] heidigartner leaves the room [19:41:20] arvindshantharam leaves the room [19:42:00] we're having a chat about the timing of the end of the dive and whether or not to extend the bottom time, are there any thoughts/votes in the room? [19:42:21] it would mean reducing the number/time of the pelagic part [19:42:40] LAT : 55.909891 , LON : -135.497907 , DEPTH : 715.323 m, TEMP : 4.1088 C, SAL : 34.15826 PSU, DO : 0.62281 mg/l, TURBIDITY : 0.9463 FTU [19:44:48] Would be very valuable to collect some sponges at the next seep location. If that means extending bottom portion then I think it would be worthwhile. So diverse and we know so little [19:46:20] Is Chrysogorgia on the collection list? [19:47:32] danielbrothers leaves the room [19:47:41] LAT : 55.910022 , LON : -135.498161 , DEPTH : 713.2022 m, TEMP : 4.10943 C, SAL : 34.15906 PSU, DO : 0.62196 mg/l, TURBIDITY : 0.8913 FTU [19:48:42] @sean: second re: collecting the abundant sponges at the next seep. And it would be a shame to miss the seep if it is in range. [19:49:45] seanrooney leaves the room [19:52:26] TIna: Chrysopathes may be. or kind of Trissopathes. more probably Trissopathes [19:52:28] yelloweye rockfish [19:52:41] LAT : 55.910092 , LON : -135.498361 , DEPTH : 713.6676 m, TEMP : 4.10765 C, SAL : 34.15839 PSU, DO : 0.63953 mg/l, TURBIDITY : 0.8913 FTU [19:53:01] christophermah leaves the room [19:53:06] robertcarney leaves the room [19:54:18] those huge dropstones with Mn stain on top of the carbonate sure do speak to the longevity of this seep [19:55:25] Heteropolypus a type of mushroom coral [19:55:42] looks new [19:55:53] snipe eel [19:56:14] Tina: Heteropolypus, quite possible ritteri [19:56:17] Snipe eel Fish [19:56:19] yeah if those large boulders were deposited at the end of the last ice age, then developed Mn stain.....that's a long lived seep! [19:56:50] Tina: and... witch eel. I love them [19:56:55] Snipe eels have birdlike beaks with curving tips. Their beaks are covered with tiny, hooked teeth — the eels sweep their beaks through the water to entangle the antennae of tasty shrimp. [19:57:04] To follow what Jamie said, we have collaborated with scientists who date authigenic carbonates with U-Th at some sites and get values of thousands of years. That doesn't mean they have been seeping the whole time, just that the carbonates formed at that time... [19:57:33] very sall backward-point teeth on snipe eel entangle antennae of pelagic shrimps [19:57:41] LAT : 55.910024 , LON : -135.498789 , DEPTH : 710.3207 m, TEMP : 4.10476 C, SAL : 34.15948 PSU, DO : 0.65228 mg/l, TURBIDITY : 0.8852 FTU [19:58:29] kelleybrumley leaves the room [19:58:32] heidigartner leaves the room [19:58:45] Tina: Nemichthys? [19:58:49] emilyashe leaves the room [19:58:51] Tina: another Heteropolypus [19:59:01] that accretion rate issue is an area of very active research [19:59:10] Depends on a number of factors [20:00:35] amandamaxon leaves the room [20:01:57] I think there were bubbles behind you [20:02:15] robertcarney leaves the room [20:02:42] LAT : 55.910104 , LON : -135.499132 , DEPTH : 705.8364 m, TEMP : 4.1024 C, SAL : 34.15885 PSU, DO : 0.62537 mg/l, TURBIDITY : 0.8791 FTU [20:03:50] that yellow slimy spongy thing was associated with the last seep [20:03:54] dense tubular sponges in the vicinity of an 'active' seep would be valuable, IMO [20:04:04] Tina: has to be tons of Heteropolypus [20:04:25] lots of different encrusting sponges [20:06:26] You guys are amazing [20:06:30] mitchellhebner leaves the room [20:07:43] LAT : 55.910095 , LON : -135.499149 , DEPTH : 705.466 m, TEMP : 4.10782 C, SAL : 34.15881 PSU, DO : 0.63641 mg/l, TURBIDITY : 0.8974 FTU [20:09:29] kelleybrumley leaves the room [20:10:19] ericaburton leaves the room [20:10:37] georgematsumoto leaves the room [20:11:02] robertcarney leaves the room [20:11:07] merlinbest leaves the room [20:11:23] Bivalve with dark periostricum [20:11:33] jamesconrad leaves the room [20:12:16] skate egg case [20:12:44] LAT : 55.910162 , LON : -135.499043 , DEPTH : 705.5225 m, TEMP : 4.10367 C, SAL : 34.15954 PSU, DO : 0.65569 mg/l, TURBIDITY : 0.8852 FTU [20:13:00] there is suddenly white bacterial mats, Id follow that [20:14:04] to starboard are the mats [20:17:45] LAT : 55.910054 , LON : -135.499165 , DEPTH : 705.314 m, TEMP : 4.10701 C, SAL : 34.15935 PSU, DO : 0.63233 mg/l, TURBIDITY : 0.8852 FTU [20:18:52] yes that is carbonate [20:19:01] periostrum extensions [20:19:16] yep - brown awning on Acharax is perisostracal (outer) layer of shell [20:20:58] ChristinaConrath leaves the room [20:21:23] sorry 'periostracum - periostracal - misspelled, which makes it especially difficult to pronounce! [20:21:29] kelleybrumley leaves the room [20:21:49] lol well i gave it a good try [20:22:46] LAT : 55.910088 , LON : -135.499203 , DEPTH : 705.4232 m, TEMP : 4.1035 C, SAL : 34.15859 PSU, DO : 0.66371 mg/l, TURBIDITY : 0.8791 FTU [20:25:27] next bubble stream we find, it might be good to collect a water sample [20:26:04] will do, thanks arvind [20:26:32] Bubble hunting! [20:26:40] seanrooney leaves the room [20:27:45] Camera 3 for the win! [20:27:48] LAT : 55.910077 , LON : -135.499087 , DEPTH : 688.424 m, TEMP : 4.12188 C, SAL : 34.15625 PSU, DO : 0.64555 mg/l, TURBIDITY : 0.8852 FTU [20:28:24] FYI: Heidi and I are TRYING to make headway with the Lophelia paper and your awesome expeiditioin is VERY distracting! [20:29:25] loll good luck! very hard to get other work done when there's such a cool dive [20:32:47] LAT : 55.910065 , LON : -135.498959 , DEPTH : 687.8463 m, TEMP : 4.11721 C, SAL : 34.15777 PSU, DO : 0.65389 mg/l, TURBIDITY : 0.8791 FTU [20:33:13] Did a bit of looking and it looks like the most likely ID for the Acharax (Order Solemyoida) is Acharax johnsoni [20:33:34] this is a pretty awesome use of multibeam! [20:34:56] robertcarney leaves the room [20:35:28] cherissedupreez leaves the room [20:35:59] Tina: it is the very first time I have seen Acharax [20:36:46] that's a gusher [20:36:49] christophermah leaves the room [20:37:48] LAT : 55.910035 , LON : -135.499321 , DEPTH : 700.8287 m, TEMP : 4.11773 C, SAL : 34.15785 PSU, DO : 0.63266 mg/l, TURBIDITY : 0.8852 FTU [20:38:13] excellent [20:38:24] the constant stream is interesting. can we zoom on bubble shape? [20:38:32] That's so concentrated! [20:38:36] So even a stream like this will make a strong return in the hydroacoustics [20:38:47] Again the sponges but only close to vent. If possible please grab some [20:39:07] i only have a small screen, but a zoom on that would be great once the pilots are set [20:40:53] Looks like possible hydrate down there I agree Jamie [20:41:36] So generally we can show that bubbles emitted even this vigorously form hydrate shells within the first meter of the seaflor when one is inside the hydrate stability zone as far as we are here [20:42:07] so most of what you are seeing would be hydrate-encased bubbles..hard to see the clear hydrate around, esp with these vigorous emissions [20:42:10] Provanna-like light brown gastropods? [20:42:24] nice tubular sponges there for sampli g :) [20:42:48] LAT : 55.910058 , LON : -135.499321 , DEPTH : 700.3332 m, TEMP : 4.11358 C, SAL : 34.15909 PSU, DO : 0.62484 mg/l, TURBIDITY : 0.8791 FTU [20:43:26] Yes, I collaborate with Tom Weber! [20:43:43] We were funded together by DOE a few years ago, and his former student is now our postdoc working on bubble dynamics [20:44:46] clump "finger sponges" to right of plume [20:45:12] You can see that these don't look like bubbles, but like bubbles encased with "ice" [20:45:24] arvindshantharam leaves the room [20:45:28] cherissedupreez leaves the room [20:45:36] kelleybrumley leaves the room [20:46:00] cool Merlin...thanks [20:46:09] heidigartner leaves the room [20:46:10] see them oscillating? [20:47:05] great videography! Usually no one wants to spend time looking at bubbles [20:47:49] LAT : 55.910058 , LON : -135.49933 , DEPTH : 700.0299 m, TEMP : 4.119 C, SAL : 34.15526 PSU, DO : 0.6533 mg/l, TURBIDITY : 0.8791 FTU [20:47:58] hydrate snow comb [20:48:09] looks like hydrate to me [20:48:13] definitely hydrate [20:48:17] 100% [20:48:18] cone [20:48:21] I vote hydrate [20:48:29] finger sponges too [20:48:39] christophermah leaves the room [20:48:40] porous structure hydrate due to its being an accumulation of bubbles.... [20:49:17] if you sample it it would start to dissolve immediately when it hits seawater; it is only stable now b/c the microenvironment is methane saturated [20:49:34] see the porous structure? This is gorgeous [20:49:45] but all these sponges loving this high flux area is pretty cool. has this been described before? [20:49:46] agglomerated bubble rinds of hydrates [20:50:10] In New Zealand several species of demosponges in the families Chalinidae Gray and Suberitidae Schmidt are found at many of the cold seep sites where they form extensive, encrusting to digitate mats. The species in New Zealand are endemic to vent and seep habitats, so we may be seeing something new. [20:50:26] At this depth, taking it from this setting would start dissolution, but dissociation would kick in high enough in the water column [20:51:11] temp here would be good. [20:52:42] does it make a sound? [20:52:49] LAT : 55.910078 , LON : -135.499359 , DEPTH : 698.9087 m, TEMP : 4.11214 C, SAL : 34.16197 PSU, DO : 0.64744 mg/l, TURBIDITY : 0.9646 FTU [20:53:17] ChristinaConrath leaves the room [20:54:08] @Kelley--does what make a sound? The bubbles *do* make a sound in audible frequencies, and there has been work monitoring them in situ with sensistive hydrophones and then inferring bubble sizes based on the frequency and other characteristics [20:54:40] I mean I realize the sonars pick it up I wondered about audible to humans. [20:54:44] @Merlin---Did you say the resolution of the temperature probe is...? Sorry I missed that before [20:54:57] just tuned in to the hydrophone, i can't make out anything beyond the beacon and the props [20:55:09] just to the degree. so all i'm getting is 3 and 4 [20:55:45] @kelley Yes, the bubbles are audible to humans. We can hear them when we form them in the lab. There are papers out there from Europe and Russia where they have monitored in situ for audible sounds, and they do detect. Bubbles generally make audible sound in frequency range of about 0.4 Hz to several kHz. [20:56:23] @Merlin--Thanks...Yes, I think any temperature change would be much smaller than a degree... [20:57:29] This is why these are "cold" seeps! [20:57:50] LAT : 55.910062 , LON : -135.499342 , DEPTH : 699.6637 m, TEMP : 4.12586 C, SAL : 34.15491 PSU, DO : 0.63111 mg/l, TURBIDITY : 0.8852 FTU [20:58:13] As opposed to "hydrothermal" [20:58:49] so cool that you can just listen. thank you! [20:58:53] Pretty impressive if you can hear the bubbles with the noise I assume the ROV makes! Mostly people have done this with various landers [20:59:12] and sensitive hydrophones [20:59:36] poralia [21:00:58] ChristinaConrath leaves the room [21:01:35] kelleybrumley leaves the room [21:02:09] janerudebusch leaves the room [21:02:39] emilyashe leaves the room [21:02:50] LAT : 55.910067 , LON : -135.499321 , DEPTH : 699.0673 m, TEMP : 4.12551 C, SAL : 34.15528 PSU, DO : 0.64168 mg/l, TURBIDITY : 0.8791 FTU [21:07:50] LAT : 55.910058 , LON : -135.499329 , DEPTH : 699.6234 m, TEMP : 4.13387 C, SAL : 34.15048 PSU, DO : 0.64716 mg/l, TURBIDITY : 0.8852 FTU [21:08:09] heidigartner leaves the room [21:09:19] Tina: Heteropolypus I think [21:09:25] Tina: good depth for it [21:09:36] collected?? [21:12:04] Tina: Heteropolypus. just my feed a bit slow [21:12:12] Thanks so much team! Should be interesting to see what we got [21:12:40] any votes to head out for a pelagic dive? or continue on the seep? we're biased towards the benthos so please pipe in [21:12:51] LAT : 55.910071 , LON : -135.499331 , DEPTH : 698.6869 m, TEMP : 4.12695 C, SAL : 34.15568 PSU, DO : 0.63709 mg/l, TURBIDITY : 0.8791 FTU [21:14:22] big Poralia [21:14:39] Im curious about making some kind of correlation between what the mutibeam showed (in the mapping portion) and the size of the actual bubble plume (s). [21:15:54] the seafloor footprint compared to the area of bubbles in the water column. [21:16:30] !!!! [21:16:42] the pelagic dive would be focused on fauna, but i was under the impression others would take over the narration for that section [21:17:20] wondering if michael was planning on piping in if we switched gears? [21:17:52] LAT : 55.910073 , LON : -135.49932 , DEPTH : 699.4375 m, TEMP : 4.12972 C, SAL : 34.15457 PSU, DO : 0.65788 mg/l, TURBIDITY : 0.8791 FTU [21:18:05] Michael me? [21:18:08] Mediaster I think [21:18:25] Mediaster tenellus.. but such an unusual locale [21:18:36] @Chris - do you think mediaster is eating the sponges? [21:18:45] that seems likely [21:18:55] Mediaster is pretty generalized.. and there's a lot of food here. [21:19:12] @Chris - guess it won't go hungry anytime soon, if so1 [21:20:06] yeah.. def. M. tenellus.. we've been seeing a lot of those. [21:20:29] Food may vary... video was gorgeous.. closeups of the diagnostic rods below the abactinal plates [21:21:29] kelleybrumley leaves the room [21:21:52] robertcarney leaves the room [21:22:38] arvindshantharam leaves the room [21:22:46] Maybe Provanna-like gastropods more on this plume [21:22:52] LAT : 55.910049 , LON : -135.499378 , DEPTH : 699.2699 m, TEMP : 4.12667 C, SAL : 34.15546 PSU, DO : 0.65113 mg/l, TURBIDITY : 0.8791 FTU [21:23:09] heidigartner leaves the room [21:23:46] ElainaJorgensen leaves the room [21:23:58] Would be good to to have a close look (zoom) at all of mushroom coral and sponges on outcrop to rt before we leave. Looked like lots of good stuff [21:24:24] ChristinaConrath leaves the room [21:24:54] and would be great to zoom on the gastropods with good hold on focus for ~~15 sec or so... [21:25:33] Possible to sample some gastropods? [21:26:16] Gorgeous image...hope you can get Cindy's zooms! [21:27:52] LAT : 55.910084 , LON : -135.499431 , DEPTH : 700.2075 m, TEMP : 4.12252 C, SAL : 34.15536 PSU, DO : 0.64583 mg/l, TURBIDITY : 0.8791 FTU [21:27:54] really an all-around remarkable site - not like any seep I have seen before, but then I haven't been in the Gulf of Alaska. [21:27:58] This is great! [21:28:07] lizdawson leaves the room [21:28:28] amphipods... [21:29:33] so are all these critters taking advantage of the carbonate outcrop or do they like something about the seep itself? I dont think of these as "seep fauna" should they be considered as that? [21:30:43] Tina: Heteropolypus are often at seeps [21:31:00] Tina: color does not matter [21:31:08] even just high quality of zoom on the snails would be great [21:31:16] @kb many seeps have very high populations of animals that are only sparse in the non-chem areas. Presumidly there is a general increase in food availability. [21:31:40] Tina: they may be almost white. but colour molph. same Heteropolypus [21:31:50]